Permutation lock



Feb. 18, 1930. T. NICOLSQN PERMUTATION LOCK Filed March 28; 1929 INVENTOR. 7770mm Nico/J or; BY

Patented Feb. 18, 1930 UNITED STATES THOMAS NIGOLSON, OF DETROIT, MICHIGAN PERMUTATION LOCK Application filed March 28,

This invention relates to a permutation lock.

It is the object of this invention to present a compact and simplified permutation lock consisting of one or more reciprocable bolts pivotally secured to a lugged key by a pair of toggle levers, the lug of the said key arranged to slidably engage a screw, and a plurality of recessed rings all of which must be in alignment before the screw can be turned to reciprocate the key to retract the bolts. The simplicity of this arrangement permits the manufacture of a lock that is relatively small and compact.

In the drawings:

Fig. 1 is a longitudinal section of the lock.

Fig. 2 is a section along the line 2-2 of Fig. 1.

Fig. 3 is a section along the line 33 of 29 Fig. 1.

Fig. 4 is an elevation of the end cover plate. Fig. 5 shows the lock operably mounted upon the door of a safe.

Referring more particularly to the drawings, it will be seen that the lock has an outer cylindrical casing 1. The casing 1 has the small central bore 2 for the reception of the bushing 3 which is retained in fixed position by any suitable means such as the screw 4, and the large bore 2*. Rotatively mounted on the bushing 3 is the ring 5 which has an annular flange 6. Rotatively mounted on the annular flange 6 of the ring 5 is the ring 7 which has an annular flange 8. Rotatively mounted on the flange 8 of the ring 7 is the ring 9.

As shown in Figs. 1 and 3, the bushing 3 has a longitudinal slot 10 and the rings 9, 7, and 5 each are recessed as at 11, 12, and 13 respectively. As shown in Figs. 1 and 3 the slot 10 of the bushing 3 and the recesses 11, 12, and 13 of the rings are in alignment.

Rotatively mounted within the bushing 3 is the screw 14; which has a square thread 15. The screw is held in the bushing 3 by means of the end plate 16 which abuts against the shoulder 17 of the screw. The screw has the square shank 18 upon which is fixed the knob 19 by means of the key 20.

The'jcylindrical casing 1 has the recess 21 which opens into large bore 2 and in which 1929. Serial No. 350,40.

is slidably mounted the key 22. The key 22 hasthe projecting lug 23 which slidably engages the screw between the successive convolutions oi the square thread 15. The casing 1 has the diametrically opposed recesses 24 and 25. Slidably mounted within these recesses are the bolts 26 and 27. The key 22 has the offset arm 28 upon which are pivotally 'mounted the toggle levers 29 and 30. The

toggle levers 29 and 30 are pivotally connected to the bolts 27 and 26 as at 31. The offset arm 28 of the key 22 permits the bolts 26 and 27 to be diametrically opposed. The bolts 26 and 27are slidably held in the recesses 24 by the cover 32 which may be secured to the casing l by any suitable means such as screws 32*. r

The rings 5, 7, and 9 are lettered externally as at 33. These letters are so arranged that a certain combination will properly align the recesses 11, 12, and 13 of the rings, and the slot 10 of the bushing 3. As shown in Fig. 1, the combination A, G, E, and G will properly align the said recesses and 'slot. By varying the arrangement of the letters, a great many difierent combinations may be achieved.

By referring to Fig. 1, it will be seen that when the rings5, 7, and 9 are so arranged that their recesses are properly aligned with each other and with the slot 10 of the bushing 3, that the key 22 can be retracted by turning the knob 19 which causes the lug 23 to slide to the right by engaging the thread 15 of the screw. The retraction of the key 22 operates through the toggle levers 29 and 30 to cause the bolts 26 and 27 to be retracted with- I in the casing. The reverse of this operation places the bolts 26 and 27 in locked position.

a t is obvious that if the recess of any one of'the rings 5, 7, and 9 is not properly aligned I with the recess of each of the remaining rings, that the key 22 will abut either against the ring 9 or the annular flange 8 or 6 of the rings 7 and 5. Hence, the recesses of all the rings must be in alignment before the key 22 can be retracted.

In Fig. 5, by way of illustration of one of the many uses of the look, I have shown the lock mounted upon the door 34 of the safe. In this instance, the safe door has slidably mounted thereon the reciprocable bolts 35 and 36 which are arranged, when in extended position, to engage the door frame 37 in the recesses 38. "When the permutation lock is in locked position, the bolts 35 and 36 abut against the bolts 26 and 27, and hence cannot be retracted, When the permutation lock .is in unlocked position, the bolts 26 and 27 are retracted within the casing 1, and hence the bolts 25 and 26 can be retracted by turning the lever 39.

What I claim is:

1. A look having in combination, a casing, at least one bolt, a screw, a key arranged to slidably engage the said screw, at least one toggle lever connecting the said key and the said bolt, and a plurality of recessed rings for the said screw arranged to prevent retraction of the said key when the recesses of {)he said rings are not in alignment with the olt.

2. A lock having in combination, a casing having a central bore, a plurality of bolts for the said casing, -a slotted bushing for the said bore, a screw rotatively mounted in the said bushing, a plurality of recessed rings rotatively mounted on the said bushing, a key arranged to slidably engage the said screw through the said slot in the bushing, and toggle levers connecting the said bolts and the said key, the said rings arranged to permit retraction of the said key when the recesses of the said rings are in alignment.

3. A look having in combination, a casing with a central bore, at least one bolt for the said casing, a slotted bushing for the said here, a screw, a plurality of recessed annularly flanged rings rotatively mounted on the said bushing, a key having a lug arranged to slidably engage the said screw, at least one toggle lever connecting the said key and the said bolt, the said key arranged to be retracted by rotating the said screw when the recesses of the said rings are in alignment.

4. A lock having in combination, an outer casing having a large bore and a small recess opening into the said bore, a key slidably engaging the said casing in the said recess and having an offset end movable within the said large bore, a plurality of diametrically opposed bolts, a pair of toggle levers connecting the offset'end of the said key and the said bolts, and screw means arranged to slidably engage said key to reciprocate said bolts.

In testimony whereof I affix my signature.

THOMAS NICOLSON. 

